I'm happy to revise my decision if you can come up with several examples that illustrates where the Perl 6 designers are ignorant of prior art.

You're drawing a very fine distinction between somewhat disjoint groups: Perl 6 designers, Perl 6 implementors, and Parrot implementors. Outside of #perl6 and perhaps #parrot, no one cares about this distinction. In truth, that finger pointing is one big reason for my disillusion with the whole thing.